Knob attachment



(No Mba-1J `C.y P. DOEBLER. KNOB ATTACHMENT.

No. 503,200. Patented Aug. 15, 1893.l

UNITED STATES PATENT OFEIcE.

CHARLES F. DOEBLER, OF HARTFORD, CONNECTICUT.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 503,200, dated August15, 1893.

Application filed November 16, 1892. Serial No. 452,159. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES F. DOEBLER, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements in KnobAttachments, of which the following is a specification.

This invention relates to that class of knob attachments in which theknob is secured to the spindle by means of clamping devices; the objectbeing to provide a knob-fastening iXable to the spindle through anintermediate clamp-actuating nut, and through a clamp not having anylongitudinal movement relative to the knob stem or spindle during thefastening operation.

In the drawings accompanying and forming a part of this speeiiication,Figure 1 is a longitudinal section of a knob attachment embodying mypresent-improvements. Fig. 2 is a transverse section in line w, Fig. l.Fig. 3 is an end view ofthe clamp, and Fig. 4 is a side view of the samedrawn in projection with Fig. 3. Fig. 5 is a view similar to Fig. 3, ofa modification of one of the details.

Similar characters designate like parts in all of the igures.

In my improved knob attachment, the spindle S is or maybe of the usualsquared crosssectional form and of uniform diameter throughout thelength thereof, as indicated in Fig. 1. This spindle is shown passingthrough the hole 2, in the door D, and is shown carrying thereoncontiguous to the door the usual bearing washer 3, Fig. 1. The knobstem6 of the knob K is fitted to slide easily but closely on the spindle S,and is shown externally threaded at 5, Fig. 1, to receive thecorrespondingly internally-threaded end of the nut or clamp-sleeve 8.The projecting end of said sleeve 8, which is at the left in Fig. 1, isbored internally tapering, or conical, the smaller end of the bore beingat the end of the sleeve farthest from the knob.

' The spindle clamp 4 shown in detail in Figs. 3 and 4, and which may bemade in two parts as shown in the gures or of a single piece as shown inthe end view Fig. 5, is formed eX- ternally conical to fit within theprojecting end of nut 8 as illustrated in Fig. 1. This clamp isinternally bored to fit the squared spindle, being longitudinallyslotted or divided at one or more points in its periphery, as forinstance at 9-9.

' The length of the spindle clamp as shown in Fig. "1 is such that itprojects beyond the clamp sleeve 8 when this is in its normal positionto bear against the bearing-washer 3 for locating the knoblongitudinally on the spindle. For covering the space at 7 between thebearing washer 3 and said clamp sleeve, I employ in practice theordinary rose 10, which may be secured to the door by the usual means.This rose is shown fitting over the projecting end of the clamp sleeve 8thereby furnishing a bearing for the knob and holding this froln lateralmovement.

In assembling the knob attachment, the spindle being in its properposition through the door D, the spindle clamp 4 is placed against theend of the knob-stem 6 and the clamp sleeve is then screwed part wayonto said stem, thus leaving the clamp sufficiently free to slide overthe spindle without resistance. The parts of the knob being thus looselyassembled together, the knob is then slid upon the spindle until the endof the spindle clamp strikes against its bearing surface thus locatingthe position of the knob upon the spindle. Next by means of an ordinarywrench applied to the usual squared portion 12 of the sleeve 8, thissleeve is screwed farther on to the threaded knob stem until thelongitudinally conical end thereof forces together the two sides 4-4 ofthe clamp 4, and binds them firmly upon the spindle. This operation byreason of the clamp resting against the end of the knob stem and havingno movement longitudinally thereof, does not tend in any way to displacethe knob stem on the spindle. By this means the knob is firmly fixedupon the spindle at the required place, the fastening operation isreadily performed, andthe fastening device holds the knob in place withgreat force.

In practice I provide, in some cases, a guard-fiange 13 on the knob forcovering the eXtreme end of the clamp sleeve and the space at 14 betweenthe end of said sleeve and the knob, thereby improving the finish andappearance of the article. v

By constructing and arranging the spindle IOO clamping device as hereinshown and described-that 'is-providing a compressible spindle-clamp andloosely and independently mounting it upon the spindle between theknob-stem and bearing-plate, with one end of said clamp bearing againstthe end of the knob-stem, as set forth, I provide for the ready removaland replacement of the sleeve clamp in case it becomes Worn or brokenthrough usage; it also permits sleeve-clamps of Various lengths ordiameters, to suit diierent cases,- to be applied Without alteration ofother parts of the knob-attachment which is of great convenience, as itpermits repairs and some alterations to be made at a nominal expensewithout Waste of time. Again by dividing or slotting the spindle-clampits entire length as shown and described, the pressule when impingingthe spindle is equal from end to end ofthe clamp and the degree of itspitch or inclination remains the same under all conditions andsubstantially coincident to the pitch or inclination of the interior ofthe sleeve bearing against it which not only obviates Wear in a greatmeasure, by an equal distribution of forces, but enhances the graspingqualities of the clamp by securing animpingement of the spindle from'end to end of said clamp.

Having thus described my invention, I claiml. In a knob-attachment, thecombination with the spindle, of the externally screw threaded knob-stemIitted to slide upon the spindle, a conical and compressiblespindleclamp loosely and independently mounted upon the spindle andadapted to bear at its end against the knob-stem as set forth, and aclamp-sleeve internally-threaded at one end to screw upon the knob-stemand conicallybored internally at its opposite end to hold in place andcompress the spindle-clamp,wl1ere by the knob-stem may be secured inproper position upon the spindle without longitudinal movement thereof,substantially as de scribed.

2. In a knob-attachment, the combination with the spindle and theexternally screwthreaded knob-stem fitted to slide upon the spindle, ofa conical spindle-clamp, slotted or divided its entire length andloosely and independently mounted upon the spindle with its end bearingagainst the knob-stem, as set forth, and a clamp-sleeveinternally-tln'eaded at one end to screw upon the knob-stem andinternally conically-bored at its opposite end to hold in place andcompress the spindleclamp, substantially as and for the purposedescribed.

CHARLES F. DOEBLER.

Witnesses:

FRANCIS I-I. RICHARDS, CHARLES K. BRYANT.

